Multi-gear gearbox and control method thereof

Abstract

The invention belongs to the field of electric automobile gearboxes and relates to a multi-gear gearbox and a control method thereof. The gearbox comprises a shifting mechanism and an executing mechanism, wherein the shifting mechanism comprises a first shifting motor, a first roller screw rod, a first shifting block, a first shifting shaft, a first sensor, a first guide shoe, a first and second gear shifting yoke, a first shifting yoke shaft, a second shifting motor, a second roller screw rod, a second shifting block, a second shifting shaft, a second sensor, a second guide shoe, a third and fourth gear shifting yoke, and a second shifting yoke shaft. The electric shifting mechanism and the executing mechanism are adopted, and two sets of independent motors and roller screw rod mechanisms are respectively used for shifting executing action of first gear and second gear as well as third gear and fourth gear, and shift selecting operation in a conventional AMT gearbox is cancelled; the multi-gear gearbox disclosed by the invention has the advantages of being simple in structure, high in control accuracy, high in response speed, and convenient to disassemble, assemble and maintain. According to the method disclosed by the invention, shift selection and shifting are automatic shifting controlled by a TCU automatic gearbox control unit without being controlled manually.

Description

technical field [0001] The invention belongs to the field of electric vehicle transmission research, and in particular relates to a multi-speed transmission and a control method thereof. Background technique [0002] The transmission is a mechanism used to change the speed and torque from the engine. It can change the transmission ratio of the output shaft and the input shaft in fixed or stepwise steps, also known as the gearbox. Speed ​​changer is made up of speed change transmission mechanism and operating mechanism, and some automobiles also have power output mechanism. Most of the transmission mechanisms are driven by ordinary gears, and some are driven by planetary gears. Ordinary gear transmission transmission mechanisms generally use slip gears and synchronizers. [0003] The original shifting mechanism of the traditional automatic transmission is: the servo valve controls the work of the cylinder or the oil cylinder, the cylinder or the oil cylinder drives the shif...

AI Technical Summary

Problems solved by technology

At the same time, the first-speed reducer with a fixed speed ratio has the problem of low motor utilization efficiency. In order to ensure the maximum speed of the car, the reduction ratio is often selected relatively small, which makes the motor work in a high torque and high current working state for a long time In this case, the efficiency of the motor is low, so that the power battery cannot provide the maximum mileage

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